I used a lil filter foam to baffle it. silk plants and smooth stone thingy in his tank didn't rip or snag panty hose feel smooth. filter out take is square. also went to store and they don't know. Other fish at the store didn't have holes in their fins in their cups and now they have little holes in their tales two of them. It didn't look like tail biting to me but idk. Makes me think he could be tail biting?? Only other thing I can think of is the filter outtake. I tided tights around the out take to see if that makes a difference. Looks awful but idk what else to do. I found another hole in his tail this morning. little hole not as big but still. :( He's calmed down about his reflection but chases himself and spreads fins some. His holes look like the pics of your fish's julio

Well I discovered the vase I had in his tank was rough coz I did the panty hose test and it snagged them.
So I think hopefully this will solve the problem, ill keep u updated.
I'm not sure if he tail bites we'll see what happens